Question

{2x+5y=7 , {3x-y=2 repede va rogggg

Answer 1

2x+5y=7
3x-y=2

Metoda substitutei
-y = 2-3x
y = -2+3x

2x+5(-2+3x)=7
2x-10+15x=7
17x=17
x=1

2+5y=7
5y=5
y=1


Metoda Reducerii

2x+5y=7
3x-y=2 / *5

2x+5y=7
15x-5y=10

+

17x / 17
x=1

2+5y=7
5y=5
y=1

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